JPH085926B2 - Continuous production method of acrylic polymer gel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a continuous method for producing an acrylic polymer gel.

[Problems to be solved by conventional techniques and inventions]

It has been already known that an acrylic monomer is converted into a polymer by irradiating it with light energy.
It is also known to continuously polymerize in a thin layer on a movable belt.

Generally, when an acrylic monomer solution is polymerized by irradiation with light energy, for example, using an ultraviolet lamp, a polymer of good quality should be stably produced unless sufficient consideration is given to the following points. I can't.

The setting conditions of light energy must be kept constant during the period required for polymerization.

When polymerizing in a thin layer, the solvent (mostly water) is volatilized from the surface by the heat of polymerization generated at the same time as the polymerization, and the solution concentration does not change significantly.

It is necessary to completely eliminate oxygen contamination that adversely affects the polymerization during the period required for the polymerization.

The layer thickness of the monomer solution and gel is controlled to be constant during the polymerization stage.

However, when the acrylic monomer concentration is extremely high, or when the layer of the monomer solution is made relatively thick (generally, these conditions increase the productivity, and the productivity The amount of heat generated by the polymerization is remarkably large, and it is difficult to completely remove the heat of polymerization even if the lower part of the movable belt is cooled with cold water, for example. As a result, the upper portion of the gel is in a bumping state, the solvent is volatilized, and the concentration of the surface side portion of the gel becomes extremely high. The non-uniform gel concentration causes variations in the polymerization rate and the degree of polymerization, making it impossible to obtain a stable quality.

On the other hand, bumping from the surface of the gel also scatters the monomer itself.For example, when directly irradiating the monomer solution with an ultraviolet lamp, the lamp tube surface and the ultraviolet lamp alone When a partition, for example, a glass plate or a transparent synthetic resin plate, is placed between the body solution layer and the body solution layer, the monomer adheres to these surfaces and becomes a polymer over time. As a result, the effective output of the ultraviolet lamp, that is, the intensity (W / m ² ) is remarkably lowered, and further, it is accompanied by the decay over time during long-term operation, and the polymerization reaction under constant illuminance cannot be performed. Since the illuminance changes every moment, it also affects the polymerization rate and the degree of polymerization of the monomer solution, and it is impossible to secure stable quality for a long time. In addition, cleaning and washing are forced to be performed each time, resulting in a significant decrease in production efficiency. For this reason, improvement is desired.

On the other hand, in the polymerization reaction, oxygen, that is, dissolved oxygen contained in the monomer solution and gas phase oxygen in the polymerization vessel is desirably, and usually, completely removed.

In the case of polymerizing in a thin layer on a movable belt as in the present invention, in order to completely remove oxygen during polymerization, for example, the movable belt main body is installed in an anoxic room. An airtight chamber is installed above the belt, and for example, an inert gas (nitrogen, carbon dioxide gas, etc.) is introduced into the airtight chamber to keep it in an oxygen-free state. As described in JP-A-61-221202, it is movable. There is a method of filling the monomer solution on the formula belt and coating it with a light-transmitting film.

Method is most desirable, but machine operation in the absence of oxygen is a remote control method because humans can not enter the room, equipment cost is high, and even if it can be implemented, when a machine failure occurs, polymerization When an abnormality occurs, the anoxic state in the room must be released once. If such a thing happens frequently, not only the productivity is significantly lowered, but also the waste of the inert gas is increased, which is not a preferable method.

Further, in the method of installing the airtight room on the movable belt, since the airtight room itself is in a stationary state, it is necessary to provide a slight gap between the airtight room and the movable belt. As a result, the inert gas leaks from the gap to some extent, and the inert gas is wasted. Also, the movable belt used for industrial production activities is considerably long, for example, 50 m, and even if an airtight chamber with a length of 50 m, a width of 1 m and a height of 0.3 m is created on the movable belt, it is 15 m ³ In order to completely replace this chamber with an inert gas, not only a considerable amount of inert gas is required, but also to maintain a constant pressurized state, for example, about 10 to 20 m ^It may be necessary to supply about ³ / H of inert gas. Since the use of inert gas does not contribute to product yield at all, anyone wants to keep it to the minimum necessary.

Although the method of (1) solves the problem of (i), since the film and the monomer solution are in contact with each other before gelation, slack that occurs when the film is supplied or due to expansion and contraction of the film due to heat of polymerization causes wrinkles. , The thickness of the gel varies greatly and a uniform layer thickness cannot be obtained, which leads to non-uniform polymerization rate. (Ii) Since the inert gas is not introduced after supplying the monomer solution, When breakage or cutting occurs, oxygen penetrates and inhibits the polymerization, so that not only a homogeneous polymer gel cannot be obtained but continuous operation cannot be performed. Also, in the manufacturing method of and,
When the movable belt is a carrier made of metal, for example, when a polymer gel having strong adhesiveness is produced, the peelability between the metal carrier and the polymer gel becomes poor, and continuous operation cannot be performed.

Further, JP-A-60-149613 and JP-A-60-14
In 9612, when an aqueous solution of a water-soluble vinyl monomer is held in a thin layer on a solid support for polymerization, an alkylene oxide addition compound, solid paraffin, polydithymer siloxane type silicone oil, etc. However, unlike the polymerization apparatus and the polymerization mode of the present invention, the thickness of the polymer gel layer is not uniform and the top and bottom surfaces of the polymer gel are not smooth.

On the other hand, if the belt is coated with Teflon or polyester resin, it will wear out after repeated use,
Its stripping effect is reduced. In addition, the resin surface is likely to be scratched, and if the monomer solution enters the recesses of the scratch and polymerizes, the anchor will be driven and the polymer gel and the support will peel off. When the resin becomes bad and is peeled off forcibly, the resin may be peeled off from the belt in a state of being adhered to the polymer gel, and thereafter, this portion may be difficult to peel off.

In this way, when the coating resin is peeled off from the belt, it is necessary to repair it, which necessitates equipment and operation stop. In addition, it is not practical to remove the scratched coating resin from a long belt on an industrial scale and then re-coat it, which is not practical because it causes a loss of cost and time.

As described above, in the present situation, it is required to improve the conventional technology to improve the process to obtain the simplest and best quality.

[Means for solving the problem]

The present inventors have arrived at the present invention as a result of earnest researches aimed at improving these problems.

That is, the present invention is a method for continuously producing an acrylic polymer gel by using a photopolymerization apparatus having an airtight chamber having a light-transmitting material part in the upper part and a movable belt, wherein a photopolymerization initiator is used. Oxygen in the monomer solution containing 1 or 2 or more of the acrylic monomers containing is adjusted to 1 mg / l or less, and then the oxygen in the gas phase in the hermetic chamber is 1% by volume or less. , The synthetic resin film is continuously supplied to the movable belt, the monomer solution is continuously supplied in a thin layer, and the monomer solution starts polymerization by irradiation of light energy. Then, a synthetic resin film is continuously supplied to the upper portion of the monomer solution at a stage showing non-fluidity, and adhered to the surface of the monomer solution, and after continuing irradiation of light energy, at the other end of the movable belt, The upper and lower synthetic resin films Dynamically it relates to a process for the continuous production of acrylic-based polymer gel peeling while the polymer gel characterized by continuously removed from the polymer gel surface.

〔Example〕

Examples of the acrylic monomer used in the present invention include (meth) acrylamide, derivatives thereof, (meth) acrylic acid, salts thereof, acid salts of N, N-dialkylaminoalkyl (meth) acrylate, quaternary salts thereof. Examples include monomers such as diallylamine acid salt, diallyldialkylammonium salt, sulfoalkyl (meth) acrylates, acrylamidoalkylsulfonic acid, and salts thereof.

Further, for example, acrylonitrile, (meth) acrylic acid esters (alkyl or hydroxyalkyl esters), styrene, vinyl acetate, methylenebisacrylamide, polyoxyethylene di (meth) acrylates, trimethylolpropane tri (meth) acrylates, Monomers such as pentaerythritol tetra (meth) acrylates may be used in any proportion depending on the purpose.

Essentially water-soluble monomers are used when a water-soluble polymer is desired, such as for paper strength enhancers, thickeners, waste water purifiers, sewage urine dehydrators and the like.

The concentration of the normally used monomer is generally 20 to 80% by weight in the case of using a water-soluble polymer, and when using the hydrophobic monomer, the hydrophobic monomer is used. It may be used as it is or diluted with an organic solvent such as toluene or xylene to an appropriate concentration.

The amount of dissolved oxygen in the monomer solution was 1 m before the polymerization reaction.
Must be limited to g / l or less. If it exceeds, unfavorable results such as generation of an unpolymerized portion and improvement in the degree of polymerization are brought about.

In the present invention, the monomer solution containing the photopolymerization initiator is in an atmosphere in which the oxygen in the gas phase in the hermetic chamber is 1% by volume or less, and the synthetic resin film is continuously supplied on a movable belt. Are continuously supplied in thin layers.

If the oxygen content in the gas phase in the hermetic chamber to which the monomer solution is continuously supplied exceeds 1% by volume, unfavorable results such as generation of an unpolymerized part and improvement in the degree of polymerization are brought about.

Typical examples of the photopolymerization initiator include benzophenone, benzoin, and benzoin alkyl ether, but azo compounds and peroxides may be used depending on the case. The amount used is preferably 0.001 to 5% by weight based on the weight of the monomer.

As the synthetic resin film continuously supplied to the movable belt, a resin film that is generally available, for example, a film made of polyethylene, polypropylene, polyester, polyamide, polytetrafluoroethylene or the like is used, but industrially used. When used for, it is desirable to make the unit price as low as possible, and in this sense, polyethylene and polypropylene are most preferable.

The thickness of these synthetic resin films is industrially continuously supplied, and it is forced to peel from the polymer gel at the other end of the movable belt. Occurs, which causes troubles such as undesired stoppage of the process, termination of polymerization, and occurrence of unpolymerization. Therefore, a suitable thickness, usually about 20 to 50 μm, is preferable.

As the synthetic resin film, for example, a long film wound in a cylindrical shape (a film of 2,000 to 4,000 m which is generally industrially available) is used.
The seams of the film can be supplied by connecting them with, for example, gum tape or adhesive tape.

As described above, the layer thickness of the monomer solution, which is supplied to the movable belt to which the synthetic resin film is continuously supplied and is used for polymerization, is 3 to 20 mm, preferably 5 to 10 mm.

The monomer solution supplied onto the movable belt is irradiated with light energy, and the monomer solution starts polymerization.

The light energy used in the present invention is usually a commercially available xenon lamp, a tungsten lamp, a halogen lamp, a carbon arc lamp, or a mercury lamp such as a high pressure mercury lamp, a low pressure mercury lamp, or an ultrahigh pressure mercury lamp. However, the use of high pressure mercury lamps is most common.

The wavelength used is slightly different depending on the type of photopolymerization initiator used, but the range of 300 to 380 nm is most effective.

It is not necessary to specifically regulate the conditions of light irradiation, but the outline of the polymerization method is as follows.

A mixed solution of predetermined monomers is prepared, a photopolymerization initiator is further added, and then an inert gas such as nitrogen gas or carbon dioxide gas is sealed in to remove dissolved oxygen. When such a monomer solution is irradiated with an ultraviolet lamp which is turned on in advance, the polymerization proceeds in a short time and a non-fluid polymer is obtained. The heat of polymerization generated during the polymerization is removed by passing a refrigerant through the polymerization tank.

Usually, the polymerization tank and the form of the polymerization are carried out in a batch type or a continuous type, but since the method of the present invention can continuously polymerize on a movable slope, the continuous type is used in the sense of improving the efficiency of production. Polymerization is preferred.

The step where the monomer solution starts to polymerize and becomes non-fluid and becomes a gel (it depends on the liquid concentration, the amount of light energy to be irradiated, etc., but usually about 1 to 5 minutes In this way), a synthetic resin film similar to that supplied on the movable belt is continuously supplied to the upper part of the monomer solution, and it is brought into close contact with the surface thereof, and continued to be irradiated with light energy to form a gel-like material. After forming the polymer gel, the upper and lower synthetic resin films are automatically peeled off at the other end of the movable belt, and the polymer gel is continuously taken out.

The film collected at the other end of the movable belt is wound into, for example, a cylindrical shape and can be reused if the film surface is not extremely dirty.

If the movable belt is made of stainless steel, depending on the polymer, the polymer adheres strongly to the surface of the stainless steel belt, and if the polymer itself does not easily peel off from the belt surface at the other end of the belt, it may be necessary to check it. To be As a solution to such a case, the above problem can be solved by automatically supplying a synthetic resin film on a movable belt and then supplying an acrylic monomer solution for light irradiation polymerization.

Further, in the method of the present invention, an airtight chamber filled with an inert gas is provided like a movable belt.

A method in which a synthetic resin film is adhered to the upper and lower parts of a gelled monomer solution, but the above problems can be solved, but the film is swelled or shrunk due to heat or polymerization heat, and the monomer solution vapors. Polymerization-inhibiting troubles due to oxygen inflow phenomenon due to increase in pressure and insufficient control of rubber weir frequently occur during continuous operation.

Therefore, in the method of the present invention, by adopting a double sealing method of a film adhesion method and an airtight chamber device, various problems in continuous polymerization can be solved satisfactorily.

The effects obtained by the method of the present invention are as follows.

It is possible to prevent a rapid reaction that occurs due to the polymerization of the monomer solution and the accompanying bumping state. As a result, the polymer concentration can be kept constant.

Contamination of the ultraviolet lamp or the transparent partition plate due to volatilization of the monomer or gel due to the rapid reaction is prevented, and the polymerization can always proceed under uniform illuminance. As a result, the polymerization rate can be made constant and the degree of polymerization can be made uniform, so that not only stable quality can be obtained at all times, but also cleaning of the lamps and partition plates is reduced and the productivity is remarkably improved.

Since the synthetic resin film is brought into close contact with each other when the polymerization is started under the flow of the inert gas, the inside of the gel covered with the synthetic resin film is filled with the inert gas. That is, to put it in an extreme way, from the stage of being covered with the synthetic resin film, the adverse effect of oxygen is hardly seen even outside the atmosphere of the inert gas, and the airtight chamber can be made compact. By introducing a small amount of inert gas, the purpose can be achieved, and not only the equipment cost can be reduced, but also the amount of undesired inert gas used can be minimized.

Since the airtight chamber is installed on the movable belt, even if the film is broken, the industrially most undesirable continuous operation can be prevented.

In the present invention, since the upper film is mounted after the monomer solution has been made non-fluidized, the defects caused by the non-uniformity of the layer thickness of the polymer gel can be greatly reduced.

The delivery of the lower film avoids contact of the polymer gel with the metal movable carrier, thus solving the problem of delamination. Further, since it is not necessary to apply a release agent or the like to the metal carrier, it is possible to prevent impurities from being mixed into the polymer gel.

It is possible to carry out a polymerization reaction at a high monomer solution concentration, which was impossible with the prior art, and it is possible to make the layer of the monomer solution thicker than before, and the same movable belt is used. Even then, the productivity can be remarkably improved.

The method of the present invention as described above not only solves the problems of the prior art, but also develops a more stable industrialized technology by the photopolymerization method, and the technology linked to the continuous production method is completely unique. However, the new manufacturing technology is provided.

 Next, the method of the present invention will be specifically described with reference to examples.

Example 1 The following monomer mixed solution and polymerization initiator solution were prepared, and the polymerization apparatus shown in FIG. 1 was adjusted as described below,
An acrylic polymer gel was continuously produced. When the synthetic resin film was not supplied, the test was carried out together, and Table 1 (polymerization state in 30 minutes reaction), Table 2 (change of polymerization apparatus with time), Table 3 (uniformity of polymer gel) The results are shown in Table 1, Table 2 and Table 3, respectively.

[Monomer mixed solution] (kg) Acrylamide 12.80 Acrylic acid 2.40 Caustic soda 1.36 Nonionic surfactant [Polyoxyethylene nonyl phenyl ether HLB = 1
5] 0.01 Thiourea 0.16 Deionized water 23.27 Total 40.00 [Polymerization initiator solution] Benzoin isopropyl ether 6g Methanol 147ml Total 150ml [Adjustment of polymerization equipment] Rubber weirs (16) are installed at both ends shown in Fig. 2. A movable belt (stainless steel endless belt) (3) with an effective width of 450 mm and an effective length of 3,000 mm is adjusted to a speed of 100 mm / min by the rotating drum (4).

Water of 15 ° C. is sprayed from the lower side of the endless belt, and the belt portion is cooled by the cooling tank (5).

Inert gas (nitrogen gas) was introduced into each of the four airtight chambers (8) (upper glass (15) upholstery) installed on the upper part of the endless belt at about 1 m ³ / H, and the airtight chambers (8) Control gas phase oxygen to 0.8% by volume or less.

The ultraviolet lamp (low-pressure mercury lamp) (9) installed at a height of about 100 mm above the airtight chamber (8) is turned on, and the intensity of ultraviolet light on the endless belt is adjusted to 20 W / m ² . Synthetic resin film (polyethylene film, thickness 30 μm,
From the entrance of the airtight chamber (8) to the surface of the movable belt (endless belt) (3)
Set it on the automatic winder (13 ').

Synthetic resin film (polyethylene film, thickness 30μ
m, width 500 mm) (10), through the airtight chamber (8) at the position of the endless belt about 500 mm (monomer solution supply port (14)
To the gel upper part at the position from (and the same below). At the other end of the endless belt, set the polyethylene film on the automatic winder (13).

The monomer mixture solution storage tank (1) was degassed with nitrogen gas to dissolve the oxygen contained in the monomer mixture solution, and the oxygen concentration in the monomer mixture solution was reduced to 1 mg / l or less. After that, it is fed through the line mixer (11) onto the movable endless belt at a speed of 13.5 l / H. On the other hand, the polymerization initiator solution (12) is likewise degassed with nitrogen gas to reduce the oxygen concentration to 1 mg / l or less and then supplied at a rate of 30 ml / H.
The monomer mixed solution and the polymerization initiator solution (12) are uniformly mixed by the line mixer (11) installed in the line, and are supplied onto the belt from the monomer solution supply port (14). The monomer mixed solution (liquid temperature about 20 ° C) is 5 mm thick and is irradiated with ultraviolet rays on the belt for 30 minutes.

Polymerization starts about 2 minutes (at a position of 200 mm) after the monomer mixed solution is supplied onto the endless belt, and then about 4 minutes (at a position of 400 mm).
At a position), a non-fluid gel (pudding-like) was exhibited. The polyethylene film supplied from the position of about 500 mm of the endless belt comes into close contact with the gel (2) and moves to the other end of the endless belt as it is. At the other end of the endless belt, the polyethylene film adhered to the upper surface of the polymer is peeled off and removed by the automatic film winders (13) and (13 '). As a result of being peeled off by the polymer peeling plate (6) and continuously obtained on the roller (7) (about 3 hours, 18 m
Of the band-shaped polymer gel).

The obtained polymer gel can be crushed into chips or granules, if necessary, and then dried or powdered. The band-shaped polymer gel obtained by the method of the present invention is crushed into chips of, for example, 3 mm × 5 mm × 5 mm, and then crushed into particles of about 3 mm by a crusher, and then at 80 ° C. for about 1 hour. Fluidized and dried. The obtained polymer powder shows a high viscosity in an aqueous solution containing almost no water-insoluble substance, and an intrinsic viscosity Is 23.5 dl / g and can be used as a flocculant and the like.

Comparative Example 1 Remove all the airtight chambers installed on the top of the endless belt, and from the position 200 mm in front of the monomer solution supply port (14), on the upper part of the rubber weir adhered to both sides of the endless belt, the length of 1000 mm, 30 mm A rubber rod was placed along the surface of the synthetic resin film.

The monomer solution was supplied between the lower part of the upper part of the endless belt and the upper part of the synthetic resin film, and nitrogen gas was blown into it to cut off the contact with the air.

Other than that, an acrylic polymer gel was continuously manufactured by the same [monomer aqueous solution], [polymerization initiator solution], and [Adjustment of polymerization apparatus] as in Example 1. However, the aqueous monomer solution adheres to the lower and upper polyethylene films immediately after the supply.

The aqueous monomer solution was supplied between two sheets of polyethylene on the endless belt and then irradiated with UV light at 20 W / m ² ,
Polymerization started in about 2 minutes (at a position of 200 mm, a position from the monomer aqueous solution supply port, and so on), and in about 4 minutes (at a position of 400 mm), a non-fluid gel (pudding-like) was exhibited.

The surface temperature of the polymer reached a maximum temperature of 68 ° C. in about 9 minutes (at a position of 900 mm), and the polymerization proceeded while moving to the rear of the endless belt (the other end). At the rear of the endless belt (the other end), the polyethylene film adhered to the upper and lower surfaces of the polymer is the automatic film winder (13)
Stripped off at (13 ') and the polymer is 450mm wide x
It was continuously obtained as a band-shaped polymer gel having a thickness of 5 mm.

95 minutes after the start of supplying the single fluid aqueous solution, a seam of the polyethylene film covering the upper part was generated, and it was supplied by connecting with an adhesive tape, but at the position around the maximum temperature (about 900 mm)
Since the polyethylene film stretched due to heat and became uneven, the seam was damaged, and the polyethylene film meandered and began to peel from the gel toward the front.
I had to stop driving in a hurry and restore the film.

While the polymerization was in progress, the gel was exposed to the air, so the film was repaired, but the gel surface part about 500 mm before and after that was incomplete polymerization, and the polyethylene film was peeled off at the back of the endless belt (the other end). As shown in Table 4, the relevant part of the polymer gel had an unfavorable result as compared with the other parts.

Moreover, the polymer upper surface obtained in Comparative Example 1 was generally lacking in smoothness.

The stop time required for repairing the film damage was about 15 minutes.

In addition, the time after the start of supply excludes the stop time for repairing the polyethylene film trouble.

Example 2 An acrylic polymer gel was continuously produced in the same manner as in Example 1 except that the inflow rate of nitrogen gas was changed, and the polymerization state was observed. Table 5 shows the results.

Example 3 [monomer mixed solution] β-methacryloyloxyethyltrimethylammonium chloride (80% by weight aqueous solution) 30.6 kg acrylamide (50% by weight aqueous solution) 11.1 kg polyoxyethylene distyrenated phenyl ether (HL
B = 12) 15 g Sodium hypophosphite 3 g Pure water 8.3 kg Total 50.0 [Polymerization initiator solution] Benzoin isopropyl ether 6 g Methanol 147 ml 150 ml The monomer aqueous solution and the polymerization initiator solution described above were prepared and prepared as in Example 1. A polymer gel was continuously produced under the same polymerization apparatus and production conditions. However, the synthetic resin film (polyethylene film) was set and carried out in the same manner as in Example 1.

About 3 minutes after the monomer aqueous solution was supplied, the temperature of the monomer aqueous solution started to rise, and at the stage of about 5 minutes, it became a non-flowing soft pudding. At this point, if the synthetic resin film (polyethylene film) (10) is brought into close contact with the upper part of the gel (2) from the upper part of the airtight chamber (8) and the polymerization is continued, the polymerization temperature reaches the maximum (58 ° C) at about 18 minutes. Became.

Thirty minutes after the start of feeding, the polymer gel obtained from the other end of the movable belt (endless belt) (3) was not observed at all on both the front and back surfaces, and a solution which was considered unpolymerized was not recognized at all. No adhesion was observed between the polymer gel and the movable belt. The resulting polymer gel was smooth without any irregularities on the upper and lower surfaces. Also, in a long run test of about 4.0 hours, no dirt or cloud was observed on the glass surface of the airtight chamber, and the ultraviolet illuminance on the belt surface was 19.2 to 20.0 W / m ² , which was only a slight decrease. It was

The analytical variation of the obtained polymer gel of about 22 m is as follows.

Polymer gel solid content (% by weight) (minimum value) (maximum value) 59.6 to 61.0 Intrinsic viscosity of polymer gel (dl / g) (minimum value) (maximum value) 8.0 to 8.3 In addition, polyethylene was used for comparison. If the film was not supplied from above, clouding and fouling of the glass surface due to bumping of the monomer became remarkable with the lapse of long run time, and it became impossible to secure the light intensity required for polymerization. The polymerization state in this case is shown in Table 6.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an apparatus suitable for carrying out the continuous production method of an acrylic polymer gel of the present invention, and FIG.
It is sectional drawing which shows the inside of the airtight chamber shown by a figure. (Main symbols in the drawings) (1): Monomer mixed solution storage tank (2): Gel (3): Movable belt (4): Rotating drum (5): Cooling tank (6): Polymer release plate (7) ): Roller (8): Airtight chamber (9): Ultraviolet lamp (10), (10 '): Synthetic resin film (11): Line mixer (12): Polymerization initiator solution (13), (13'): Automatic winder (14): Monomer solution supply port (15): Glass (16): Weir

Claims (1)

[Claims] 1. A method for continuously producing an acrylic polymer gel using a photopolymerization apparatus having a movable belt and an airtight chamber having a light-transmissive material portion on an upper portion thereof, wherein a photopolymerization initiator is used. Oxygen in the monomer solution containing 1 or 2 or more of the contained acrylic monomers is adjusted to 1 mg / l or less, and then the oxygen in the gas phase in the hermetic chamber is set to 1 vol% or less. Yes, by continuously supplying the monomer solution in a thin layer on the movable belt to which the synthetic resin film was continuously supplied, the monomer solution starts polymerization by irradiation of light energy. Then, a synthetic resin film is continuously supplied to the upper portion of the monomer solution at the stage of showing non-fluidity, and adhered to the surface of the monomer solution. And lower synthetic resin film automatically The method of continuous production acrylic polymer gel characterized by taking out the polymer gel while separated from the polymer gel surface continuously.